diff --git a/src/count-down/index.js b/src/count-down/index.js
index f1da533..f3364df 100644
--- a/src/count-down/index.js
+++ b/src/count-down/index.js
@@ -6,7 +6,7 @@ Component({
         format: Array,
         clearTimer: Boolean
     },
-    externalClasses: ['countdown-class'],
+    externalClasses: ['i-class'],
     data: {
         time: '',
         resultFormat: [],
diff --git a/src/count-down/index.wxml b/src/count-down/index.wxml
index e4bec57..08e4cb2 100644
--- a/src/count-down/index.wxml
+++ b/src/count-down/index.wxml
@@ -1,4 +1,4 @@
-<text class="countdown-class">
+<text class="i-class">
   {{time}}
 </text>